在 Linux shell 下直接执行 `taos` 连接到 TDengine 服务，进入到 TDengine CLI 界面，示例如下：

```text
$ taos
Welcome to the TDengine shell from Linux, Client  Version:2.0.5.0
Copyright (c) 2017 by TAOS Data, Inc. All rights  reserved.
taos> show databases;
name       |   created_time    |   ntables  |  vgroups   | replica | quorum | days |    keep1,keep2,keep(D)   | cache(MB)|   blocks  |  minrows   |  maxrows  | wallevel |  fsync    | comp | precision |    status  |
=========================================================================================================================================================================================================================
test       | 2020-10-14  10:35:48.617 |     10 |      1 |    1 |   1 |     2 | 3650,3650,3650        |     16|      6 |     100 |    4096 |    1 |    3000 |  2 | ms      | ready    |
log        | 2020-10-12  09:08:21.651 |      4 |      1 |    1 |   1 |   10 | 30,30,30               |      1|      3 |     100 |    4096 |    1 |    3000 |  2 | us    | ready    |
Query OK, 2 row(s) in set (0.001198s)
taos>
```
